Hard coating film

Abstract

A hard coating film including: a polymer binder resin; first inorganic particles which are dispersed in the polymer binder resin and have an average particle size of 5 nm or more and less than 70 nm; and second inorganic particles which are dispersed in the polymer binder resin and have an average particle size of 70 nm to 150 nm, wherein a content of the second inorganic particles having an average particle size of 70 nm to 150 nm is 4% by weight to 12% by weight, and a maximum amplitude (A) based on an average friction force is 0.15 or less in a graph of measuring a friction force with a TAC film which is measured by applying a load of 400 g to the surface thereof, is provided.

The invention claimed is: 
     
       1. A hard coating film comprising:
 a polymer binder resin; 
 first inorganic particles dispersed in the polymer binder resin and having an average particle size of 5 nm or more to less than 70 nm; and 
 second inorganic particles dispersed in the polymer binder resin and having an average particle size of 70 nm to 150 nm, 
 wherein a content of the second inorganic particles having an average particle size of 70 nm to 150 nm is 4% by weight to 12% by weight, 
 a maximum amplitude (A) based on an average friction force is 0.15 or less in a graph for measuring a friction force with a triacetyl cellulose (TAC) film which is measured by applying a load of 400 g to the surface thereof, and 
 wherein the maximum amplitude (A) is a maximum value of the absolute values of the difference between an average friction force and a maximum friction force and the difference between the average friction force and a minimum friction force, after measuring the average friction force, the maximum friction force, and the minimum friction force in a kinetic test distance section of the friction force measurement graph. 
 
     
     
       2. The hard coating film of  claim 1 ,
 wherein at least two second inorganic particles are distributed on the polymer binder resin while being spaced apart by a distance of 0.1 μm or more. 
 
     
     
       3. The hard coating film of  claim 1 ,
 wherein the second inorganic particles having an average particle size of 70 nm to 150 nm are dispersed in the polymer binder resin with no agglomeration. 
 
     
     
       4. The hard coating film of  claim 1 ,
 wherein, with regard to at least two second inorganic particles, a distance between one surface of the hard coating film and a center of the second inorganic particles in a direction perpendicular to the one surface of the hard coating film is 35 nm to 5.0 μm. 
 
     
     
       5. The hard coating film of  claim 4 ,
 wherein the at least two second inorganic particles, of which the distance between one surface of the hard coating film and the center of the particle in a direction perpendicular to one surface of the hard coating film is 35 nm to 5.0 μm, are adjacent to each other in a horizontal direction with respect to one surface of the hard coating film while being spaced apart by the distance of 0.1 μm to 1.5 μm. 
 
     
     
       6. The hard coating film of  claim 1 ,
 wherein the second inorganic particles are placed only inside the hard coating film. 
 
     
     
       7. The hard coating film of  claim 1 ,
 wherein at least one reactive functional group is introduced onto surfaces of the first inorganic particles and the second inorganic particles. 
 
     
     
       8. The hard coating film of  claim 7 ,
 wherein one or more reactive functional groups selected from the group consisting of a (meth)acrylate group, an epoxide group, a vinyl group, and a thiol group, or a compound including the reactive functional group, is introduced onto the first inorganic particles and the second inorganic particles, respectively. 
 
     
     
       9. The hard coating film of  claim 8 ,
 wherein the compound having the reactive functional group is a silane compound or a hydroxide compound including one or more reactive functional groups selected from the group consisting of a (meth)acrylate group, an epoxide group, a vinyl group, and a thiol group. 
 
     
     
       10. The hard coating film of  claim 7 ,
 wherein the reactive functional group introduced onto each surface of the first inorganic particles and the second inorganic particles forms a crosslinking bond with the polymer binder resin. 
 
     
     
       11. The hard coating film of  claim 1 ,
 wherein the polymer binder resin includes one or more selected from the group consisting of an acrylic resin, an epoxy group, a vinyl group, and a thiol group. 
 
     
     
       12. The hard coating film of  claim 1 ,
 further comprising a fluorine-based compound including a reactive functional group, which forms a crosslinking bond with the polymer binder resin. 
 
     
     
       13. The hard coating film of  claim 1 ,
 wherein a content of the first inorganic particles is 1% by weight to 30% by weight with respect to 100% by weight of the hard coating film. 
 
     
     
       14. The hard coating film of  claim 1 ,
 wherein the first inorganic particles and the second inorganic particles are one or more selected from the group consisting of silica and a metal oxide. 
 
     
     
       15. The hard coating film of  claim 1 ,
 wherein at least one surface of the hard coating film has two or more unevennesses, and 
 a height of the unevenness is 1 nm to 50 nm. 
 
     
     
       16. The hard coating film of  claim 15 ,
 wherein an average distance between the unevennesses is 0.1 μm to 1.5 μm. 
 
     
     
       17. The hard coating film of  claim 1 ,
 wherein a thickness of the hard coating film is 500 nm to 30 μm.